Written by IAPMO 3:00 pm Uniform Codes Spotlight

UNIFORM CODE SPOTLIGHT

April 4, 2024

From the 2024 UPC Illustrated Training Manual, Chapter 7 – SANITARY DRAINAGE

704.2 Single Vertical Drainage Pipe. Two fixtures set back-to-back, or side-by-side, within the distance allowed between a trap and its vent, shall be permitted to be served by a single vertical drainage pipe provided that each fixture wastes separately into an approved double-fixture fitting having inlet openings at the same level.

FIGURE 704.2A
DOUBLE FIXTURE FITTING
FIGURE 704.2B
SANITARY TEE AND DOUBLE FIXTURE FITTING

From the 2024 UMC Illustrated Training Manual, Chapter 8 – CHIMNEYS AND VENTS

803.2.4 Vent Offsets. Where the common vertical vent is offset, the maximum capacity of the common vent shall be reduced in accordance with Section 803.2.5, and the horizontal length of the common vent offset shall not exceed 18 inches per inch (18 mm/mm) of common vent diameter (D). Where multiple offsets occur in a common vent, the total horizontal length of all offsets combined shall not exceed 18 inches per inch (18 mm/mm) of the common vent diameter. [NFPA 54:13.2.5]


FIGURE 803.2.4A
VENT MANIFOLDS

FIGURE 803.2.4B
VENT OFFSETS

(This is not to be considered the official position of IAPMO, nor is it an official interpretation of the Codes.)

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IAPMO develops and publishes the Uniform Plumbing Code®,the most widely recognized code of practice used by the plumbing industry worldwide; Uniform Mechanical Code®; Uniform Swimming Pool, Spa and Hot Tub Code®; and Uniform Solar Energy, Hydronics and Geothermal Code — the only plumbing, mechanical, solar energy and swimming pool codes designated by ANSI as American National Standards — and the Water Efficiency Standard (WE-Stand)™. IAPMO works with government, contractors, labor force, and manufacturers to produce product standards, technical manuals, personnel certification/educational programs and additional resources in order to meet the ever-evolving demands of the industry in protecting public health and safety.

Last modified: April 4, 2024

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